adding zooming (not implemented correctly for non-diagonal representation)
adding zooming (not implemented correctly for non-diagonal representation)


Former-commit-id: 8c1bbb0fab5d963369db85d28d9d8d016bc3fb70
uwgraphics/CooccurViewer,uwgraphics/CooccurViewer,uwgraphics/CooccurViewer,uwgraphics/CooccurViewer